28747767 has 4 divisors (see below), whose sum is σ = 38330360. Its totient is φ = 19165176.

The previous prime is 28747759. The next prime is 28747781. The reversal of 28747767 is 76774782.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28747767 - 2³ = 28747759 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28747717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4791292 + ... + 4791297.

It is an arithmetic number, because the mean of its divisors is an integer number (9582590).

Almost surely, 2^28747767 is an apocalyptic number.

28747767 is a deficient number, since it is larger than the sum of its proper divisors (9582593).

28747767 is an equidigital number, since it uses as much as digits as its factorization.

28747767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9582592.

The product of its digits is 921984, while the sum is 48.

The square root of 28747767 is about 5361.6944150147. The cubic root of 28747767 is about 306.3383522952.

The spelling of 28747767 in words is "twenty-eight million, seven hundred forty-seven thousand, seven hundred sixty-seven".